NO. 1139. DEEP-WATER MOLLUSC A YERRILL AND BUSH. 853 



strongly curved, and bears about nine broad, elevated, strong, trans- 

 verse teeth of which five or six in the middle are much larger than the 

 others; above these the outer hinge margin is somewhat expanded and 

 everted. There is a thin, continuous ligament both before and behind 

 the beaks. Epidermis thin, pale greenish yellow. The inner ventral 

 margin is thin and plain. 



Length, 4.9 mm. ; height, 3.9 mm. 



Some of the smaller specimens have a narrower and less thickened 

 hinge-plate with the teeth more delicate than in the type. 



Four specimens, at four stations, between N. lat. 40, W. long. 71 

 14' 30", and K lat. 37 8', \V. long. 74 33', in 157 to 444 fathoms, 

 1881-1885. 



This species has some resemblance to S. tennis, but it is much less 

 oblique and more elongated in form, and is less inequilateral, the pos- 

 terior end not being subtruucated, while the anterior end is narrower, 

 relatively shorter, and much less oblique. The hinge-margin is also 

 different; the teeth are fewer and much stronger, and the hinge-margin 

 much broader, while the chondrophore is smaller, more rounded, much 

 less oblique, and projects freely from the inner hinge-margin instead of 

 being united closely to it. 



It also bears some resemblance in form to Nuctda pernambuccnsis 

 Smith, 1 but there are marked differences in the hinge and number of 

 teeth. 



NUCULA GRANULOSA Verrill. 

 (Plates LXXXI, fig. 2; LXXXVIII, fig. 8.) 



Nucula granulosa VEKHILL, Trans. Conn. Acad., VI, p. 280, 1884; Expl. Albatross, 

 Report U. S. Com. Fish and Fisheries for 1883, p. 576, 1885. DALL, Bull. U. S. 

 Nat. Mus., No. 37, p. 42, 1889. 



Taken at about sixteen stations, between X. lat. 41 53', W. long. 65 

 35', and N. lat. 38 30' 3", W. long. 73 6', in 384 to 1,061 fathoms, 

 1880-1886. 



NUCULA VERRILLII Dall. 

 (Plate XCV, fig. 10.) 



NuctiJa irigona VERRILL, Trans. Conn. Acad., VI, p. 438, 1885 (not Bronn, 1849. not 

 Seguon/a, 1877). 



Nncnln rerriUH DALL, Bull. Mus. Coinp. Zool., XII, p. 248,1886; Bull. U. S. Nat. 

 Mus., No. 37, p. 42, 1889 ; Pror. U. S. Nat. Mus., XII, p. 257, pi. xiv, fig. 4, 1889.- 

 BUSH, Bull. Mus. Conip. Zool., XXIII, pp. 240, 243, pi. i, fig. 6, 1893. 



Comparatively few specimens, at six stations, between 1ST. lat. 39 43' 

 45", W. long. 70 7', and N. lat. 3(5 47', W. long. 73 9' 30", in 1,140 to 

 1,825 fathoms, 1884-1886. South to Yucatan, in 430 to 1,685 fathoms. 

 Dall. 



1 Report Voy. Challenger, Zool. Lamellibrauchiata, XIII, p. 227, pi. xvm, figs. 

 10-10a, 1885. 



